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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8ee025db140aa1b6beedc5367daecea366e582a1bfa821b54b8652564ef3aa' 
  AND token = '+jwTka/pvS3X+SX9qJXbLc/9IpclKdpUxtJ+AoD0pQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}